History of Earth

Front

What event led scientists to believe that humans' ancestors migrated out of Africa?

Back

A mountain chain rose up and changed the land they lived on.

Front

Why were plants and insects able to grow so large during the early Paleozoic era?

Back

High levels of oxygen.

Front

What significant event marked the time when sea life began to thrive after the Snowball Earth period?

Back

Cambrian explosion.

Front

What does the term 'Paleozoic' mean?

Back

Ancient life.

Front

What is caused by Earth's molten iron core?

Back

Magnetic field.

Front

What is the significance of the Cambrian explosion in Earth's history?

Back

It marks a period when a rapid diversification of life occurred in the oceans.

Front

What are the four main geological eras of Earth's history?

Back

Precambrian, Paleozoic, Mesozoic, Cenozoic.

Front

What major event occurred during the Mesozoic Era?

Back

The age of dinosaurs.

Front

What is the primary characteristic of the Cenozoic Era?

Back

The rise of mammals and birds.

Front

What does the term 'PreCambrian' refer to?

Back

The time before the Cambrian period, encompassing the majority of Earth's history.